10020012221 has 4 divisors (see below), whose sum is σ = 10064153472. Its totient is φ = 9975870972.

The previous prime is 10020012199. The next prime is 10020012271. The reversal of 10020012221 is 12221002001.

It is a happy number.

10020012221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10020012221 - 2⁶ = 10020012157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020012271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22070285 + ... + 22070738.

It is an arithmetic number, because the mean of its divisors is an integer number (2516038368).

Almost surely, 2^10020012221 is an apocalyptic number.

It is an amenable number.

10020012221 is a deficient number, since it is larger than the sum of its proper divisors (44141251).

10020012221 is an equidigital number, since it uses as much as digits as its factorization.

10020012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44141250.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10020012221 its reverse (12221002001), we get a palindrome (22241014222).

The spelling of 10020012221 in words is "ten billion, twenty million, twelve thousand, two hundred twenty-one".